My answer to What is the normal age for memory loss?
Answer by Connie b. Dellobuono:
Dementia or Alzheimer and memory loss can start at 55 yrs of age. Dementia or Alzheimer is 20% genetic and 80% environment (nutrition,meds,drugs,alcohol,stress,infection,virus,sugar, lack of exercise, toxins such as aspartame and other inflammatory substances (metals)